Crompton Controls M20 - Manual (Page 12)

Emotron AB 01-2551-01r4 Wiring 11
5 Wiring
The following wiring diagram provides an example of how the M20 can be con-
nected to control the start/stop circuit of a three-phase motor, Fig. 1. Connec-
tions to a single-phase motor are described later in this manual (Fig. 2) as are the
programming changes necessary for such applications. The default setting for
the M20 is 3-phase.
1. The current transformer CTMxxx must be placed in the same phase that is
connected to terminal 9, phase L1, see Fig. 1. Failure to follow this require-
ment will result in the monitor failing to function.
2. For single-phase connection see fig 2.
When using DC voltage, terminal 6 should be connected to negative polarity
(ground) and terminal 5 to positive polarity (max. 48 VDC). See also Alterna-
tive auxiliary circuit (Fig. 16) in chapter 9.
Note: The current transformer (CTMxxx) must be placed in the same phase
that is connected to terminal 9, phase L1, see Fig. 1.